KR890004369Y1 - Tone and pulse dial transmitting circuit - Google Patents

Abstract

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Description

Tone, Pulse Combined Dial Transmission Circuit

1 is a block diagram according to the present invention.

2 is a concrete circuit diagram of one example of the block diagram of FIG.

3 is a pulse dial signal output operation waveform of FIG.

4 is an operation waveform diagram of the tone dial signal output of FIG.

* Explanation of symbols for main parts of the drawings

1: bridge rectifier circuit 2: voltage supply circuit

3: mode selection circuit 4: tone signal output circuit

5: pulse signal output circuit 6: tone, pulse signal generating circuit

7: call circuit 8: ringer circuit

9: keypad

The present invention relates to a telephone capable of transmitting a tone and pulse dial signal, and in particular, the tone and pulse dial signal transmitting circuit is constituted by one circuit, and thus the tone and pulse dial signal can be arbitrarily selected. It is about a circuit.

Typically, the dialing method of the telephone sets depends on the switching system of the telephone station. In other words, if the telephone exchange system is an electronic switching system, a multifreqency code is a method of transmitting a multifreqency (TONE signal) as a dial signal and calling the other party (callee) through the exchange. Dialing type telephone should be used. Also, if the telephone exchange system is a mechanical exchange system, the pulse dialing method is a method of outputting an electrical signal (pulse signal) as a dial signal and interrupting the trunk line to call up and down through a mechanical exchange. You must use your phone.

When the pulse dialing telephone is used in an electronic exchange as in the latter case, it is inconvenient to receive a special service of the electronic exchange. Therefore, the use of an MFC telephone, which is a complex frequency dialing method, is essential for the electronic exchange. There was a problem that cannot be used in a mechanical exchanger. Therefore, if the dialing method of the independent telephone company switchboard and the user's phone are different, purchase a telephone of the same method as that of the telephone company's switchboard, or the user may select and use a dial transmission method suitable for the telephone exchange center (electronic or mechanical). There was a problem that you have to buy a tone, pulse dual-use phone. In addition, the conventional tone and pulse dialing telephone has been provided with a tone signal transmitting circuit and a pulse signal transmitting circuit separately, which has been a problem of cost increase due to the increase of the man-hour.

Therefore, an object of the present invention is to provide a tone and pulse dial dialing telephone circuit capable of arbitrarily selecting and transmitting a dial signal suitable for an exchange method of a corresponding telephone exchange by configuring a tone and pulse dial signal transmitting circuit as one arc. .

The present invention for achieving the above object is a rectifier for rectifying the trunk line power input to the trunk line terminal to a predetermined voltage and outputting the polarity, and the first DC voltage and the second DC of a predetermined level by inputting the predetermined voltage A voltage supply circuit for outputting a voltage, a mode selection circuit for inputting the first DC voltage to bypass the voltage of the trunk line to form a trunk line current loop, and outputting a switching signal for tone and pulse mode selection; It is operated by inputting the second DC voltage as the operating power source, and after inputting the mode selection signal output from the mode selection circuit, the tone or pulse which generates and outputs the tone or pulse signal of digit by the keypad pressure A signal generating circuit, a tone signal output circuit for outputting a tone signal to a trunk line when the tone signal is output from the tone and pulse signal generating circuit, and And a trunk line and the signal output when the pulse signal output circuit by interrupting a line for transmitting a dial pulse signal, characterized in that the ringer circuit and money for outputting a ringer signal input to the terminal made of an trunk call circuit to be fulfilled.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram according to the present invention, a bridge rectifier (1) for polarizing the trunk line signal input to the trunk line terminal (L1) (L2) and outputs a predetermined voltage, and the direct current from the bridge rectifier (1) A first DC voltage of a predetermined level by inputting a ring signal from which the component is removed and a ringer circuit 8 for outputting a ringer signal as an audible sound, and a predetermined voltage output from the bridge rectifier 1; A voltage supply circuit 2 for outputting a second DC voltage, a mode selection circuit 3 for inputting a first DC voltage to bypass a signal of a trunk line and selecting a tone and a pulse mode, and the voltage supply circuit Tone and pulse signal for outputting the second DC voltage stably output at (2) as the power supply voltage and inputting the selection signal output from the mode selection circuit 3 to output the tone and pulse signal by pressing the keypad 9. Generating circuit 6 and generating the tone and pulse A tone signal output circuit 4 for outputting a tone signal by forming a pass and a call path for inputting a predetermined signal to the call circuit 7 and outputting a tone signal when a predetermined signal is output from the furnace 6; When the pulse signal is output from the tone and pulse signal generating circuit 6, the pulse signal output circuit 5 which outputs the pulse signal by preventing parasitic pulses and the ringer signal input through the bridge rectifier circuit 1 are audible. A ringer circuit 8 for outputting a signal and a call circuit 7 for inputting and reproducing a predetermined signal output from the tone output circuit 4 and making a call with a signal through a voice (call) path. .

2 is a detailed circuit diagram of an embodiment of the block diagram of FIG. 1, in which a circuit composed of a hook switch H / S, a resistor R0, a capacitor C4, and a bridge diode BD is a bridge rectifier circuit 1. And a circuit composed of diodes D1-D4 and resistors R1-R2, zener diode ZD1, capacitor C2, and transistor Q1 correspond to voltage supply circuit 2, and resistor R3. A circuit composed of R8, R13, zener diode (ZD2), diode (D5) and transil diode (XV1) corresponds to the pulse signal output circuit (5), and resistors (R9-R12) and capacitors A circuit composed of (C3), transistor (Q5) and mode selector switch (SW1) corresponds to mode select circuit (3), and a circuit composed of transistors (Q6-Q9) and resistors (R14-R21) is a tone signal output circuit. Tone corresponding to (4) and corresponding to the number by pressing the keypad 9, a tone for generating and outputting a pulse signal, a pulse signal generating circuit 6 and a ringer And ringer circuit 8 for outputting a, consists of a call group call circuit 7 to be fulfilled.

The tone and pulse signal generation circuit 6 in the configuration shown in FIG. 2 is an example of using the S-7230 chip manufactured by Seiko Instruments Ins.

3 and 4 are waveform diagrams showing that the tone signal and the pulse signal are output in the circuit of FIG.

Hereinafter, a detailed circuit diagram of an embodiment of FIG. 2 according to the present invention will be described in detail with the waveform diagrams of FIGS. 3 and 4.

If the ring signal provided from the exchange (not shown) is input to the terminal L1 and L2 while the hook switch H / S is in the hook-on state, the capacitor for DC blocking (C4) is input. After the direct current signal is removed, the signal is input to the ringer circuit 8, which is a known circuit.

At this time, the ringer circuit 8 which inputs the ring signal from which the DC signal has been removed converts it into an audible sound and drives an internal speaker to notify that a telephone call is received.

When a user who requests a ring signal picks up a call by hooking the hook switch (H / S) by lifting the handset, the ring signal is blocked and the trunk line power is bridged through the resistor R0. It is input to the diode BD. Accordingly, the bridge diode BD polarizes the trunk line power and outputs a positive voltage and a negative voltage. Therefore, the voltage is divided by the voltage drop of the diodes D1-D3 and the resistor R2, and when the divided voltage is input to the base of the transistor Q1, the transistor is inputted by the high potential as the resistor R1 at the collector terminal. Q1 is turned on and outputs a first direct current voltage to the collector terminal. At this time, the first DC voltage flows through the diode D4 and is converted into a constant second DC voltage by the zener diode ZD1 to be input to the power terminal VDD of the tone and pulse signal generation circuit 6 as an operating power source. do.

At this time, the Zener diode ZD1 and the capacitor C2 connected to the cathode of the diode D4 maintain the first DC voltage output from the collector terminal of the transistor Q1 at a constant signal voltage and output the second DC voltage. It is an element for doing this. In addition, the transil diode XV1 of the pulse signal output circuit 5 is an element for protecting the circuit at the time of overvoltage induction, such as a lightning strike, at the terminals L1 and L2. The first DC voltage output from the collector terminal of the transistor Q1 is divided by the resistors R2 and R11 and input to the base voltage of the transistor Q5, and the signal of the AC component among the input signals is applied to the capacitor C3. Via is directly bypassed to the anode of the diode of the above-mentioned bridge rectifier (BD). As the first DC voltage is inputted through the collector resistor R10 at the collector terminal of the transistor Q5, the transistor Q5 is "turned on" so that a DC loop is formed and at the same time, the tone and pulse generation circuit 6 The potential of the terminal becomes low potential as shown in FIGS. 3A and 4A.

The tone and pulse signal output path 6 is a circuit composed of one chip as described above. The Hook Switch Sensing terminal is used to recognize a hook-off when it is "low" and to recognize a hook-on when the receiver is "high".

Among the terminals of the tone and pulse signal output circuit 6 The mode select terminal is a pulse dial operation in the case of a "high" signal input and a tone (TONE: MFC) generation operation in the case of a "low" input.

(Dial pulse out) is the pulse signal output terminal, T. O (Tone out) is the tone output terminal, and VDD is the power terminal.

In addition (Mute) is a mute terminal, which is an active " low " terminal for outputting a signal for muting the transmission dial signal when a key signal is input in the dial pulse transmission mode.

XMIT mute is an active "low" terminal for outputting a signal for reducing the tone signal input to the call circuit 7 when the mode is the tone generating mode and the key signal is input.

OSC IN and OSC OUT are the oscillating crystal connection terminals and the clock source input terminals for generating pulses and tones.

Therefore, for the above operation, the power supply terminal VDD of the tone pulse signal generating circuit 6 is in an operating state in which it is recognized that a constant second DC voltage is supplied, and the dial pulse terminal And MUTE jacks Becomes high potential by the first voltage supply by resistors R7 and R14.

At this time, as the transistor Q6 is turned on by the base input resistor R15, the base potential of the transistor Q9 is turned to the low potential.

Therefore, the trunk line signal inputted through the trunk line terminal L1 and the bridge rectifier circuit 1 for polarity alignment (call signal of the other party) is communicated through the emitter-collector terminal of the transistor Q9 and the speech path SPTH1. It is input to the circuit 7.

The call circuit 7 for inputting the voice signal of the opposite station through the emitter-collector and the speech path SPTH1 of the trunk line terminal L1, the bridge rectifier BD, and the transistor Q9 is amplified by the speaker Rx. Output through line Rx1, and signal through speech path SPTH2 through trunk line terminal L2 and bridge rectifier BD is amplified in call circuit 7 and input to line Rx2 of speaker Rx. do.

Accordingly, the signal through the trunk line terminal L1 and L2 is amplified and transferred to the speaker Rx through the communication circuit 7 and converted into an audible sound.

In addition, the signal transmitted from the line Tx1 of the microphone Tx is output to the trunk line terminal L1 through the speech path SPTH1, the transistor Q9, and the bridge diode BD through the communication circuit 7 and the microphone. The signal output from the line Tx2 of the Tx is output to the trunk line terminal L2 through the speech path SPTH2 and the bridge diode BD of the communication circuit 7.

Therefore, the first and second speech paths SPTH1 and SPTH2 of the bridge diode BD, the transistor Q9 and the communication circuit 7 are connected to the signal paths of the trunk lines L1 and L2 and the communication circuit 7. It is through.

At this time, the detailed operation of the call circuit 7 is a known circuit such as the call circuit section 40 of 86-2168 filed by Utility Model Registration on March 5, 1986 by the present applicant.

On the other hand, when the user wants to dial and picks up the handset and hooks (HOOK-OFF), as described above, in the mode selection circuit 3, the trunk line signal is formed with a loop and the mute terminal of the tone and pulse generating circuit 6 High potential is output to " on " transistor Q9.

Therefore, a dial tone signal, which is provided from a local exchange (not shown) and is output from the bridge diode BD, is output to the collector terminal of the transistor Q9 and input to the call circuit 7. Can confirm (audible) the dial tone. If the telephone exchange of the user's telephone station is mechanical, the tone selector switch (SW1) is connected to the pulse terminal side (pulse) so that the tone and pulse generator circuit 6 is in the transmission mode in which the trunk line is electrically controlled. Can be sent.

At this time, when the key of the keypad (9) is pressed, the tone (X-tal) of the tone and pulse signal generating circuit (6) oscillates as shown in FIG. Mute terminal The potential of also becomes low potential as shown in the waveform of FIG. Therefore, the transistor Q6 is turned off, and thus the transistor Q9 is also turned off so that a predetermined trunk line signal output from the bridge diode BD is cut off from the communication circuit 7 and a transmission mute outputting a transmission signal (XMIT MUTE). Terminals As shown in FIG. 3 (D), the transistor Q7 is turned off due to low potential, thereby inputting to the call circuit 7 through mute, which is the first voltage output from the collector of transistor Q1. do. At this time, the communication circuit 7 for inputting the first voltage from the mute cuts off the internal circuit.

At this time, dial pulse terminal of tone / pulse signal generator 6 In Fig. 3, the impulse is output as a waveform of a pulse as shown in Fig. 3B by the number of the keypad 9 pushbuttons.

Therefore, pulse terminal The pulse signal outputted from the transistor is input to the base of the transistor Q4 through the resistor R8 as shown in FIG. 3 (B). When the logic of the pulse is inputted as a "high" or "low" signal, the transistor Q4 ) Is turned on and off, and the impulse signal is output to the collector and input to the base terminal of the transistor Q3.

Therefore, the impulse signal is inputted to the base of the transistor Q2 through the collector resistor R5 of the transistor Q3, and the pulse line is sent by intermittently controlling the trunk line in accordance with the on / off of the transistor Q2.

At this time, the resistor R4 and the capacitor C1 remove the parasitic pulse generated by the on / off of the transistor Q2 by the charge / discharge (time constant) of the resistor R4 and the capacitor C1. The zener diode ZD2 is a constant voltage collector for preventing the voltage of the line from falling below a threshold voltage when the transistor Q2 is turned on.

On the other hand, as described above, the hook sensing signal " low " is input to the terminal HS of the tone and pulse signal generating circuit 6, and the mute terminal , Transmit mute terminal In the state that the "high" signal is output from the user's telephone exchange is electronic, the MODE SELECT switch (SW1) connected to the tone (TONE) to input the low potential state, the tone, pulse signal generation The circuit 6 operates in a mode capable of transmitting a complex frequency.

At this time, if any button on the keypad 9 is pressed, the crystal (X-tal) connected to the tone and pulse signal generating circuit 6 oscillates as shown in FIG. 4 (e) to correspond to the pressed number of the keypad 9. The frequency is issued to the corresponding composite frequency in the signal generation circuit 6 and output to the tone output terminals TONE OUT (T, O).

In addition, the complex frequency signal output from the output terminals (T, O) is a signal as shown in FIG. 4 (bar), is input to the base of the transistor Q8 through the resistor R18, and the complex frequency is transmitted to the collector side. The output signal is output to the trunk line of the bridge diode BD and the trunk line terminals L1 and L2 and is input to the communication circuit 7 through the transistor Q9 in the on state.

At this time, by adjusting the emitter resistance (R18) of the transistor (Q8) it is possible to adjust the level value of the complex frequency, while the mute transmission terminal while the complex frequency signal is being sent The high potential input through the resistor R16 is in a low potential state as shown in FIG. 4 (d) to block the transistor Q7 so that the high potential through the resistor R16 passes through the mute circuit MUTEL. It is input to the mute end of 7).

The communication circuit 7 for inputting the first voltage, which is the output of the collector of the transistor Q1, through the murine MUTEL cuts off the output of the internal talk circuit by the inputted first voltage, The input of the first voltage is supplied to the internal sign circuit of the communication circuit 7 so that the tone signal output from the collector side can be recognized.

At this time, the communication circuit 7 outputs a part of the tone signal input to the speech path SPTH1 through the emitter-collector to the transistor Q9 to the speaker Rx.

In addition, the mute terminal of the tone and pulse signal generating circuit (6) Regardless of the output of the composite frequency signal, the high potential state output from the resistor R14 is maintained as shown in FIG. 4 (C) to become a forward voltage to the resistor R13 and the diode D5 to turn on the transistor Q4. Let's do it.

Therefore, the output voltage of the bridge rectifier BD is kept constant by the transistor Q2 and the zener diode ZD2 to supply the talk current.

Therefore, according to the present invention, the tone signal sending circuit and the pulse signal sending circuit are constituted as one circuit as described above, and the user can arbitrarily select the dial signal sending method according to the exchange method of the subscribing exchange, and reduce the cost due to the reduction of labor. There is an advantage.

Claims (2)

Bridge rectification circuit 1 for rectifying and rectifying the trunk line power supply with a predetermined voltage and a communication circuit 7 for inputting a predetermined signal to make a call, and outputting a ringer signal as an audible sound when a ring signal is input. Ringer circuit (8), keypad (9) and tone pulse mode selection terminal for pressing a dialing signal Hook Sensing Terminal , Key input terminal, mute terminal , Transmit mute terminal Has a mode selection terminal Hook sensing terminal And a tone for generating a tone, a pulse signal in response to an input of a key input terminal, a tone having a pulse signal generating circuit 6, and a pulse dial output circuit for combining a pulse, wherein a predetermined voltage is output from the bridge rectifying circuit 1. A voltage supply circuit 2 for outputting a first direct current voltage and a second direct current voltage having respective levels, and the first direct voltage to input a hook-off determination signal tone pulse dialing mode selection switch operation A mode selection circuit 3 for outputting a selection signal to the tone pulse signal generating circuit 6 and the tone selection by pressing the keypad 9 when the mode selection signal of the mode selection circuit 3 is a tone dial. And a tone signal output circuit 4 for outputting a complex frequency signal output from the outer terminals T and O of the pulse signal generation circuit 6 to the trunk line and the communication circuit 7, and the mode selection circuit 3 ) Mode selection signal is pulse dial The tone by the pressure of pad 9, a dial pulse output terminal of the pulse generating circuit 6 And a pulse signal output circuit (5) for inputting a pulse signal output from the pulse signal and outputting a pulse dial signal by interrupting a trunk line according to the signal of the input pulse. 2. The tone signal output circuit (4) according to claim 1, wherein the tone signal output circuit (4) is a mute terminal of the tone and pulse signal generation circuit (6). The transmission mute terminal of the tone and pulse signal generation circuit 6 receives the first DC voltage output from the communication path means and the voltage supply circuit 2 for disconnecting and disconnecting the trunk line signal from the communication circuit 7 according to the potential of. And a muting means for controlling the transmission mute of the communication circuit (7) by turning on and off in accordance with the potential of.